Low temperature sintering and microwave dielectric properties of Li2MgTiO4-based temperature stable ceramics

Abstract New temperature-stable Li 2 MgTiO 4 -10 wt%LiF-12 wt%Ca 0.8 Sr 0.2 TiO 3 (LMT-LiF-CST) composite ceramics with low firing temperature were fabricated via the solid-state reaction method. XRD and SEM-EDS analysis confirmed that Li 2 MgTiO 4 and Ca 0.8 Sr 0.2 TiO 3 crystal phases can be well coexisted and no secondary phase is included. As for the addition of Ca 0.8 Sr 0.2 TiO 3 , the e r and τ f showed to increase, while Q×f declined, due to complementation properties of the end members in LMT-LiF-CST. In summary, the LMT-LiF-CST composite ceramics sintered at 900 °C for 5 h showed desirable microwave dielectric properties: e r =18.0, Q×f=34,800 GHz(at ~8.2 GHz),τ f =4 ppm/°C, and good chemical compatibility with silver electrode.